At registration only username in email salutation

-- HikaShop version -- : 2.6.2
-- Joomla version -- : 3.5.1
-- PHP version -- : 5.6
-- Browser(s) name and version -- : Chrome latest

Hi supportteam,

If a user registers at the checkout he get a status email salutation with his username.
For example: Hi m.jhonsson74,

But when a user do a checkout as a guest het get a status e-mail salutation with his real name.
For example: Hi Mike Jhonsson,

How can I configure Hikashop to get in both situation the real name in the email like the way somebody checkout as a guest?

I use the simple registration without password and guest.

Hope you can help me.

Kind regards,
Lumiga

Thanks!